3.5mm 1/8" TRS to Dual 6.35mm 1/4" TS Mono Y Cable. Gold Plated 3.5mm 1/8" TRS to 6.35mm 1/4" TS Mono Y-Cable Splitter Cord is perfect for connecting your laptop, iPhone, iPod with a jack speaker output to a device with 2 x 6.35mm jack inputs - e.g. AV receiver, amplifier, mixing desk and so on.
eBay